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A sample size of 40 yields a sample mean of 24 and a sample standard deviation of 4.0
Test HO: mean > 25 at a = 0.10. HA: mean < 25
This is a one-tailed test with lower reject region bounded by a negative critical value
he number of reservations for its January flight to Germany, 305 reservations for tourist class,185 Economy class, and 206 first class. To fill all the seats how many of each kind of plane should the company fly?
A class of fourth-graders was asked to bring a pumpkin to school.- Verify that the sample mean, trimmed mean, and median are X‾= 229.2, X‾t = 220.8, and M = 221.
Scores by women on the SAT-I test are normally distributed with a mean score of 998 and a standard deviation of 202. scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6 assume the two tests ..
If writing scores for population have standard deviation of s = 20, does sample give sufficient evidence to conclude that new composition course has significant effect? Suppose a two tailed test with a = 0.05.
Of 260 females, 224 answered yes. Construct a contingency table to evaluate the probabilities. What is the probability that a respondent chosen at random:
What are the reasons for conducting a two-way analysis rather than two separate one-way ANOVAs? Explain.
(a) What is the probability that a PC is in a bedroom? (b) What is the probability that it is not in a bedroom?
To test the hypothesis that 48% of PC users have never used a Mac, the analyst took a sample of 50 PC customers drawn at random and found that 22 of them had never used a Mac.
consider the following. give your answers correct to two decimal places.a find the standard score z such that the area
describe the direction of the relationship between the hamstring strength index 60degs and the shuttle run test.
Find the maximum total allowable weight if you want a 0.975 probability that this maximum will not be exceeded when 16 males are randomly selected.
Males had a mean cholesterol level of 195 and a standard deviation of 10. If the campus was equally divided between males and females, how many males on this campus would be at increased risk?
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